from math import sqrt

def add (x, y):
    return x+y

def sub(x, y):
    return x-y

def mul(x, y):
    return x*y

def div(x, y):
    return x/y

if __name__== "__main__":
    print(add(1, 2))

    print(sub(4, 3))

    print(mul(4, 5))

    print(div(8, 3))